I cut my own own hair. Why not? I'm practically bald and I look like a chia pet every 2nd or 3rd day if I don't cut it.
I can't go to a barber every three days
I'm sure I save money but have to take meticulous care of the "appliances." They aren't inexpensive. Maintaining them isn't free, either.
Unfortunately, they run on lithium batteries, and this makes them disposable after about a year. The head to the head shaver is expensive and might last six months.
Last time I had to take care of this the head shaver was going to die and the low end replacement was only 2x the price of the head, so I just bought a new head shaver.
Shaving is easily my most expensive grooming expense.